<template>
  <div class="login-container">
    <div class="login_box">
      <!--头像区域-->
       <div class="avatar_box">
         <img src="../assets/logo.png" alt="">
       </div>
       <!--登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0" class="login_form">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
        </el-form-item>
         <!--密码-->
         <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
         </el-form-item>
         <!--按钮区域-->
         <el-form-item class="btns">
           <el-button type="primary" @click="login">登录</el-button>
           <el-button @click="resetLoginForm">重置</el-button>
         </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>


export default {
  name: 'Home',
  data(){
    return{
      //这是登录表单的数据绑定对象
      loginForm:{
        username:'admin',
        password:'123456'
      },
      //这是表单的验证规则对象
      loginFormRules:{
        //验证用户是否合法
        username:[
           { required: true, message: '请输入登录名称', trigger: 'blur' },
           { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        //验证密码是否合法
        password:[
          { required: true, message: '请输入登录密码', trigger: 'blur' },
           { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods:{
    //点击重置按钮，重置登录表单
    resetLoginForm(){
      //console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login(){
      this.$refs.loginFormRef.validate(async valid=>{
        //console.log(valid)
        if(!valid) return;
        const {data:res}=await this.$http.post('login',this.loginForm)
        //console.log(res)
        if(res.meta.status!==200) return this.$message.error('登录失败');
        this.$message.success('登录成功');

        //1.将登录成功之后的token,保存到客户端的sessionStorage中
        //   1.1项目中除了的登录之外的其他API接口，必须在登录之后才能访问
        //   1.2token只应在当前网站打开期间生效，所以将token保存在sessionStorage中，
        //console.log(res)
        window.sessionStorage.setItem('token',res.data.token)
        //2.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="scss" scoped>
 .login-container{
   background-color:#2b4b6b;
   height:100%;
   .login_box{
     width:450px;
     height:300px;
     background-color:white;
     border-radius:3px;
     position:absolute;
     left: 50%;
     top:50%;
     transform:translate(-50%,-50%);
     .avatar_box{
       height:130px;
       width: 130px;
       border-radius:50%;
       border:1px solid #eee;
       padding:10px;
       position:absolute;
       left:50%;
       transform:translate(-50%,-50%);
       background-color:#fff;
       box-shadow:0 0 10px #ddd;
       img{
         width: 100%;
         height:100%;
         border-radius:50%;
         background-color:#eee;
       }
     }
     .login_form{
       position:absolute;
       bottom:0;
       width:100%;
       padding:0 20px;
       box-sizing:border-box;
     }
     .btns{
       display:flex;
       justify-content:flex-end;
     }
   }
 }
</style>